Hydrocarbon-motor.



M. TlBBE'T-IS. HYDROCARBON MOTOR.

APPLICATIQN FILED MAY I3, 1911.

1,138,908. Patented May 11, 1915.

name

MILTON TIBBETTS, 0F DETROIT, MICHIGAN, ASSIGNOR T0 PACKARD MOTOR CAR COMPANY, 015 DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

nYnnboaasoN-Mo'ron masses.

Specification of Letters Patent.

Patented May 11, 1915.

To all whom it may concern Be it known that I, MILTON Tinen'rrs, a citizen of the United States, and resident of Detroit, Wayne county, State of Michigan, have invented certain new and useful Improvements in Hydrocarbon-Motors, which the following is a specification.

This invention relates to hydrocarbon motors, and particularly to motors employing rotary valves for the inlet and exhaust ports and in which the various accessories of the motor such as the magneto and pump, are operated by the valve driving mechanism.

Une of the objects of the invention is to so design the valve operating mechanism that worm or spiral gearing may be used and that these spiral gears may be of comparatively small diameter so that their peripheral speed may be low to reduce the inertia of the driving shafts and minimize Wear.

Another object of the invention is to pro- Vide a spiral gear valve operating mechanism for a motor of the above type in which .the shafts and gears will be'symmetrically arranged and easy to manufacture.

Another object of the invention is to provide a spiral gear valve driving mechanism of simple construction and in which the valves may be rotated either in the same direction or in reverse directions.

Another object of the invention is to so arrange the valve operating mechanism that the magneto for the motor ignition system may be conveniently driven through spiral gearing from one of the shafts of said Valve operating mechanism at any desirable position vertically on the motor and the pump for the water circulation system may also be conveniently driven from one of the shafts of the valve operating mechanism at practically any desired height.

In motors of, this type as used for motor vehicles it is desirable that the magneto should be mounted at a convenient height "forrunniug the high tension wlres therei from to the ignition plugs and at the same time it is desirable to place the water circulating pump as low as possible in order to keep the pump primed and to get the best results. It is also found desirable. in some "cases to drive the pump at a different speed than the magneto since the magneto must conform to certam spec1fied specds'snch as crank shaftspeed on a l-cylmder motor and one and one-half revolutions to one of the crank shaft on a G-cylinder motor. Hence the desirability of separate driving mechanism for the magneto and water pump.

Various other advantages accrue in consequence of the construction and arrangement of a motor embodyingthis invention, and these advantages and objects other than as herein particularly set forth will appear in the following detail description.

In the drawings, Figure 1 is affront elevation of a motor embodying this invention; and Fig. 2 is a small cross sectional View showing the arrangement of the rotary valves.

The motor cylinder 10 is suitably water jacketed as shown at 11 and mounted upon the two-part crank case 12 in which are the bearings for the. motor crank shaft 13. In

Fig. 2 the piston 14 is illustrated as being at the top of the exhaust stroke. The head of the cylinder is somewhat enlarged and bored to form separated cylindrical seats 15' and 16 for a rotary inlet valve 17 and a rotions of the crank shaft so that the inlet and exhaust ports may each be opened once for every two revolutions of the crank shaft for operating the motor on the four stroke cycle. To obtain the best results it is desirable that the valves 17 and 18 be placed on opposite sides of the cylinder as shown and for 'this reason they cannot be conveniently operated by a single driving gear arranged between them without making such gear of considerable diameter. The size of such intermediate operating gear would not be excessive if spur gears were employed .at this point, but for making a quiet motor it is found that spiral or worm gears are particularly advantageous. In the present invention, therefore, the inlet valve 17 is provided with a spiral gear 23 which meshes with a small spiral gear 24- on a vertical operating shaft 25 and the exhaust valve 18 is provided with a spiral gear 26 meshing with a small spiral gear 27 on a vertical'operating shaft 28 which latte r shaft is preferably arranged parallel with the shaft 25'to give symmetry to the mechanism. The shafts 25 and 28 eX- timing of the other valve.

Mounted at a convenient height on an integral ledge 32 of the crank case is a mag- 'neto 33, the shaft 34; of which extends tangential to the-shaft 28 and is connected to the latter through a pair of spiral gears 35, and by the proper arrangement of the pitch of these gears the magneto may be driven at crank shaft speed or at one and one-half revolutions to one revolution of the crank shaft, as may be desired for a four or a six cylinder motor;

The water circulating pump 36 is mounted on the crank case or adjacent thereto at a considerable distance below the magneto and at a point where it may always be primed from the water in the motor water jackets, and the pump shaft 37 is referably connected to the operating sha t 25 through a pair of spiral gears 38. This gear ratio may be such as to give the pump the most advantageous speed.

It is believed that the operation andadvantages of the invention will be apparent from the above description.

Having thus described my invention, what I claim is:

1., In a hydrocarbon motor, the. combination with separate inlet and exhaust rotary valves, of means for operating said valves from the crank shaft comprising a pair of vertical shafts extending from either side of the crank shaft to points adjacent the valves,

spiral gearing between said vertical shafts"- and the crank shaft, and spiral gearing between the upper ends of saidshafts and said valves.

2. In a hydrocarbon motor, the combina-- tion with the crank shaft having a spiral gear thereon, a rotary valve for controlling the motor inlet port and having a spiral gear thereon, and a rotary valve independent of the said rotary inlet valve for controlling the motor exhaust port and having. a spiral gear thereon, of an operating shaft having gears in mesh with the spiral gear on said crank shaft and the spiral gear on said inlet valve, and a second operating shaft having spiral gears in mesh with the spiral gear on said crank shaft and the spiral gear on said exhaust valve;

3. In a hydrocarbon motor, the combination with separate intake and exhaust rotary valves inthe head ofthe motor, of a pair of vertical shafts for independently driving said valves from the motor crank shaft, a magneto, gears for driving said magneto from one of said vertical shafts, a water circulation pump, and means for driving said pump from the other of said vertical shafts? 4. In a hydrocarbon motor, the combination with separate inlet and exhaust rotary valves in the head of the motor, of a pair of non-alined shafts for independently rotating said valves, driving connections between said shafts and the motor crank shaft, an electric machine, a water circulation pump, and means for driving said machine and pump from said shafts respectively.

In testimony whereof I affix my signature 80 in the presence of two witnesses.

MILTON TIBBETTS.

jyi tn esses W. H. FINCKEL, Jr.,

RICHARD E. MARSTON. 

